JEE Main 2021 · 24 Feb · Shift 1 · Chemistry Q33

ChemistrySingle correct+4 / -1Question 33 of 90

Consider the elements Mg, Al, S, P and Si, the correct increasing order of their first ionization enthalpy is :

Al < Mg < Si < S < P

Mg < Al < Si < P < S

Mg < Al < Si < S < P

Al < Mg < S < Si < P

Answer and worked solution

Official answer: A

Period 3 trend with two dips: Al < Mg (3p electron easier to remove) and S < P (paired 3p electron). Order Al < Mg < Si < S < P.

(A)

Topics:Ionisation enthalpy

JEE Main 2021 · 24 Feb · Shift 1, Chemistry question 33